(;GM[1]FF[4]SZ[19]
GN[Why the vital point ?]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem12/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem12/Solution

Why the vital point ?]
PL[W]

AB[cn][bp][cp][ep][eq][gq][fr][fs]
AW[cq][dq][br][er][ds]

;W[cs]C[W1]MN[1]
;B[dr]C[B2]MN[2]
;W[es]C[W3]MN[3]

;
)
